城市轨道交通车辆客室门系统的安全完整性水平分配

Safety Integrity Level Allocation of Passenger Door System for Mass Transit Vehicle

安全完整性水平是指在一定时间、一定条件下安全系统能够执行所规定的安全功能的概率,即在要求安全系统动作时其功能失效概率的倒数。安全完整性就是安全功能能够有效被执行的能力。讨论了安全完整性水平确定的定性、定量方法。介绍了如何遵照功能安全的国际标准进行安全完整性水平选择。功能安全是整体安全的一部分,其执行是依靠子系统或者设备对于输入的正确响应。结合城轨车辆客室门系统具体事例,介绍了如何实现安全完整性水平分配。

The concept of safety integrity level, the qualita- tive ＆ quantitative method for determining safety integrity levels are discussed in this paper. According to international standards,the selection of safety integrity level for func- tional safetyis introduced. Functional safety is a part of in- tegral safety, and is realized by correct feedback from the sub-systems or equipment. Based on specific passenger door system for mass transit vehicle, the way to realize safety in- tegrity level allocation is also introduced.